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• <br />Table 12 <br />OVERALL SUITABILITY T-TEST COMPARISON OF SOUTHFIELD MINE <br />SOILS AND REFUSE MATERIALS AS PLANT GROWTH MEDIA <br />• <br />• <br />Darameter <br />pH (all samples) <br />(w/o oldest) <br />EC <br />SAR (all samples) <br />(weathered) <br />SP <br />OC <br />Texture <br />CaCO3 <br />Rock Fragments <br />< 3' <br />> 3' <br />Acid Base Pot. <br />B <br />Se <br />AWC <br />-NO3-N <br />,P <br />-K <br />~Zn <br />- Fe <br />soil suitability <br />1.00* <br />1.00 <br />1.00 <br />1.03 <br />1.03 <br />1.00 <br />1.00 <br />1.00 <br />1.00 <br />refuse suitability <br />1.38 <br />1.00 <br />1.05 <br />1.71 <br />1.00 <br />1.00 <br />1.00 <br />1.00 <br />1.00 <br />significance <br />.001 <br />NS <br />NS <br />.001 <br />NS <br />NS <br />NS <br />NS <br />NS <br />3.00 2.20 .10 <br />1.00 1.00 NS <br />1.50 1.00 .05 <br />1.00 1.00 NS <br />1.00 1.00 NS <br />2.17 2.00 NS <br />2.64 1.25 .001 <br />1.62 1.67 NS <br />1.03 1.17 NS <br />2.17 1.73 NS <br />2.56 1.00 .001 <br />OVERALL AVERAGE 1.48 1.28 NS <br />(* This comparison was developed using the following methods. The WDEO Guidelines <br />for topsoil substitutes were used for the parameters of pH, EC, OC, Se and B. The <br />NMMMD Guidelines for soil substitutes were used for SAR, texture, CaCO3, coarse <br />fragments, and acid-base potential. The USDA-SCS Guidelines for drastically disturbed <br />soils were used for AWC. Numerical values of 1, 2 and 3 were assigned to the <br />suitability classes of suitable, marginal and unsuitable, respectively. Each observation <br />was then used as a single datum for calculating the overall suitability class for each <br />parameter. Potential nutrient deficiencies were determined according to the <br />recommendations in Soltanpour et. al. (1985). NO3-N rankings were determined by <br />assigning values of 1, 2 and 3 to soils requiring supplemental nitrogen fertilizer at the <br />rates of 0, 20 and 40 pounds per acre, respectively. P and K suitability values were <br />determined by assigning values of 1 and 2 to soils requiring 0 and 30 pounds per acre <br />of supplemental fertilizer. Zn and Fe suitability values were determined by assigning <br />values of 1, 2 and 3 depending on whether the soils tested adequate, marginal or low, <br />respectively. The overall suitability average was calculated by averaging the suitability <br />index for each parameter. Thus, the lower the suitability value the better the overall <br />quality of that particular parameter.) <br />37 <br />